The present work relates to manufacturing of a simple interferometric optical fiber refractometer that features broad refractive index measuring range without ambiguity. The device consists of a cylindrical polymer cavity whose shape and dimensions are easily controllable. This in turn allows to control the performance of the refractometer. The signal processing is simple; it consists of calculating the amplitude and phase of the fast Fourier transform of the normalized interference spectra. In this manner, the refractive index value of the sample is obtained independently of the temperature. The refractometer can be used to measure the refractive index of liquids or viscous samples and can operate in a broad wavelength range. As an application, we demonstrate the measuring of the refractive index of gels at different temperatures from which the thermo-optic coefficient can be calculated.

本发明涉及一种简单的干涉式光纤折射仪的制造，其具有宽广的折射率测量范围而没有歧义。该设备由一个圆柱形的聚合物腔组成，其形状和尺寸易于控制。这进而允许控制折光仪的性能。信号处理简单；它包括计算归一化干涉光谱的快速傅立叶变换的幅度和相位。以这种方式，与温度无关地获得样品的折射率值。折光仪可用于测量液体或粘性样品的折射率，并且可以在较宽的波长范围内工作。作为应用，